Program for generation of drainage network using different thresholds for different regions:
In the article “On the start of the drainage network defined from digital elevation models” we discussed that it may be inappropriate to use a single minimum drainage area value to delimit the drainage network in basins with varying physical characteristics.
If you are a GIS user, and would like a program to define your drainage network based on the algorithm that we present in the article, you can try using this program here (beta version).
Examples of input data can be found here.
If you understand programming, you can also download the source code for this simple program, in VB .NET, here.
This concept has also recently been implemented in our newest free basin discretization tool, coupled with MapWindow GIS, the IPH-Hydro Tools!